Lubricating system for an internal combustion engine



H. D. CHURCH May 2, 1933.

LUBRICA'IING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE Filed Oct. 2. 1950m" 1 'ENTOR H D. C H u RC H Patented May 2, 1933 u NiTEn- STA-TiasPATENT OFFICE rumors) D. cannon, or CLEVELAND, .onio, Assmiioa ro rim,wrn'rn moron comm, or CLEVELAND, 01110, A, coarona'rronor omo'LnBmcAa-ma'sirsrm Ion an INTERNAL comst'rsrron ENGINE I limitation medOctober 2, 1936.- Serial so. 485,899. 7

. This invention. relates to alubricating system foran internalcombustion engine. 1

It is an object of this invention to. providea simple and efficientcirculatory lubricating 5 system for an internal combustion engineembodying a radiator or like apparatus for cooling the lubricantusedtherein. i

It is a further object of this invention to provide. alubricating-system, as defined 1n the first object of inventionabovieset forth,

in which a leak in the cooling apparatus-will neither deplete the systemof lubricant, or'

terminate the delivery of lubricant to the wearing surfaces of theengine. 1

Further objects of invention-will appear in the following description,when read in connection with the accompanying drawing which forms a partof this application, and in which; a T

The figure is a side elevation, partly in section, of an internalcombustion engine provided with a lubricating system embodying thisinvention.

With the exception of the lubricating system hereinafter described'theengine illustrated in the drawing is of a more or less conventionaltype. It comprises a cylinder block 10, a crank case 11, an oil pan 12,a cam shaft 13 mounted at one side of the crank case in bearings 14, anda crank shaft 15 mounted in the central portion of the crank case inbear ings 16,

Mounted on the side wall of the crank case, 5 11 below the cam shaft 13.there is a pair of oil pumps 17 and 18 driven from the cam shaft bymeansof a common driving shaft 19. The upper'pump 17 is provided-with anintake pipe 20. extending downward into the oil pan 12, and communicatesthrougha pipe 21 and a manifold 22 with a. plurality ofrducts 23leading'to the'cam shaft andcrank shaftbearings 14 and 16. The-lowerpump 18 provided with an inta-ke'pipe v24 which ex- 4 tends into the oilpan 12 to a less depth than engine driven fan 28 vwhich acts tobothtcool the radiatort27 andaforwardly disposed radiator (not shown forthe engine cooling water. The chamber 26 communicates with a chamber 29in lower header of the radiator 5 v 27 through a tortuous system ofconduits'comterior of the oilflpan 12 through a pipe 32, a

pair of. serially connected ducts 33 and 34 formed in the bottom wall ofthe oil pan, and an upwardly directed. pipe 35 whichextends into thelower flared-end-of the intakepipe20. During operation of theengine,-the pump 18 draws from the oil pan 12 a volumetric l flow ofoilin excess to that drawn up by the simultaneously operated pump 17delivering thesamethrough the pipe 25 into the radiator27, and from theradiator 27through the "conduits 32,33, 34 and 35 into the mouth of vthe intake pipe 20. The pump 17 draws up a portion of-the cooled oildelivered into the mouth of the intakepipe20 by the pump 18,

- and deliversit through thespipe 21, manifold 22, and ducts 23 to theengine bearings 14 and 16, from where it flows, downward into the oilpan 12, Theremainingport-ion of the oil delivered into the intake pipe20 by the pump 18 flows back into the reservoir through the annularspace intermediate the upper end of the pipe 35 and thecircumjacentlower end 35 of the intake pipe 20.;- I

.Should the pump 18 fail to deliver a flow of oil into the intake pipe20, from any. cause other than the system having been depleted ;.of anamount of-oilsufiicient to lower the oil level within the oil pan belowthe lower end of theplpe20, thejpumplS will draw-oil directly from theoil pan. 12 through the annular spaoe'existing between theupper end .'ofthe pipe 35 and the lower end-of the intake pipe 20, delivering the sameto the engine bearings 14,and16 in.1placeof the cooled 7 oil normallydelivered theretm. 1

It is to be noted that the external parts of the system, including theradiator 27, the

pipe'32, and the upper portion of the pipe 25, are so locatedthat a leakcreated therein can not possibly result in the expulsion from the systembysthe pump. 18 of a suflicient amount of oil tolower the oil level inthe oil pan below the-intake pipe 20, and that as a result the bearings14 and 16 will be supplied with oil by the pump 17, notwithstanding thatthe pump 18 has expelled from the system through a leak in the externalarts the maximum amount of oil permitt by the allocation of the externalparts.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific termionologyis not intended to berestrictive or confining, and that various rearrangements of parts andmodifications in structural details may be resorted to without departingfrom the scope or spirit of the invention as claimed. r

I claim as my invention:

1. In a lubricating system for an internal combustion engine, alubricant reservoir, means for delivering lubricant from said reservoirto wearing surfaces in said engine including an intake conduit openingintosaid reservoir,means for returning to said reservoir the lubricantsupplied to said wearing surfaces, and means for cooling the oil in saidsystem including a radiator, a conduit communicatin at its opposite endswith said reservoir an said radiator resigned to convey lubricant fromsaid reservoir to said radiator, and a conduit for conveying lubricantfrom said radiator communicating at its opposite ends with said radiatorand said reservoir, said first named means and said second named meansbeing so arranged and designed that said first named means is suppliedby said second named means with lubricant substantially unmixedwith thelubricant in said reservoir. a

2. In a lubricating system for an'internal combustion engine, alubricant reservoir, means for delivering lubricant from said reservoirto wearing surfaces in said engine including an intake conduit openinginto said reservoir, means for returning .to said reservoir thelubricant supplied to said wearing surfaces, and means for cooling theoil in eluding an intake conduit opening into said reservoir, means forreturning to said reservoir the lubricant supplied to said'wearingsurfaces, and meansfor cooling the oil in said .system including-aradiator, a conduit for conveyingoil-from said-reservoir-to saidradiator, and aconduit=for conveying oil from said radiatorextendinginto.the mouth of the aforesaid intake conduit and communicating withsaidreservoir through a space intermediate its discharge end and the innerwall ofthe aforesaid intake conduit.

4. In a lubricating system for an internal combustion engine, alubricant reservoir, means for delivering lubricant from said reservoirto wearing surfaces in saidengine including an intake conduit openinginto said reservoir, means for returning to said reservoirthe'lub'ricant'supplied to said wearing surfaces, and means for-coolingthe oil in said system including a radiator located outside of saidengine-above said reservoir, a conduit for conveying lubricant from saidreservoir to said radiator-communicating at one end with said reservoirat a point above the mouth ofjthe' aforesaid intake conduit and at itsopposite-end with said radiator, and a conduit for conveying'lubricantfrom said radlator communicating at its'opposite ends with said-radiatorand-said reservoir, said first name-d means and said second" named meansbeing so arranged and designed that said first named means is suppliedby said second named means with lubricant substantlally unmixed with thelubricant in said reservoir. v i a 5. In a lubricating system for an'internal combustion engine; a" lubricant reservoir, means a fordelivering lu'bricantfiom said reservoir to weari'ngsurfaces in saidengine including an intake-conduit opening into said reservoir, means-fo'r' returning' to said reservoir the lubricant supplied to saidwearing surfaces, and means for cooling the oil in said system includinga radiator located outside of sai-d'engine above said reservoir, aconduit for conveyin'glubric'ant from said reservoir to-said radiator,-communicating at one end with said' reservoir at a point above the mouthof the aforesaid intake pipe and at its other end withs'aidi-radiaton-acon- 1 duit for conveying oil fromsaid radiator extending into the mouthof the aforesaid intake conduit and communicating-with said reservoirthrough a space intermediate its discharge end and the "inner'wallof theaforesaid intakeconduit, and an engine driven fan for cooling saidradiator.

In testimony whereof I hereunto aflix my signature this 26th day ofSeptember, 1930. v HAROLD D, CHURCH.

CERTIFICATE OF CORRECTION.

Patent No. 1,906,538. May 2, 1933.

HAROLD D. CHURCH.

iiication of the line 34, claim the syllable It is hereby certified thaterror appears in the printed spec above numbered patent requiringcorrection as follows: Page 2, l, for "resigned" read "designed"; andline 65, claim 3, after "ervoir" insert the word "to"; and with thesecorrections therein that case in the Patent Office.

Signed and sealed this 23rd day of May, A. D. 1933.

the same may conform to the record of the M. J. Moore. ActingCommissioner of Patents.

(Seal) that the said Letters Patent should be read.-

